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Note 17 - Shareholders' Equity - Non-vested Options Activity (Details) - € / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Non-vested options outstanding (in shares) 575,000    
Non-vested options outstanding, weighted average grant-date fair value (in EUR per share) € 1.47    
Non-vested options granted (in shares) 155,000    
Non-vested options granted, weighted average grant-date fair value (in EUR per share) € 1.93 € 1.33 € 1.29
Non-vested options vested (in shares) (204,400)    
Non-vested options vested, weighted average grant-date fair value (in EUR per share) € 1.52    
Non-vested options forfeited (in shares) (70,600)    
Non-vested options forfeited, weighted average grant-date fair value (in EUR per share) € 1.58    
Non-vested options outstanding (in shares) 455,000 575,000  
Non-vested options outstanding, weighted average grant-date fair value (in EUR per share) € 1.58 € 1.47